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LONG-RUN MARGINAL COST: The change in the long-run total cost of producing a good or service resulting from a change in the quantity of output produced. Like all marginals, long-run marginal cost is the increment in the corresponding total. What's most notable about long-run marginal cost, however, is that we are operating in the long run. Unlike the short run, in which at least one input is fixed, there are no fixed inputs in the long run. As such, there is only variable cost. This means that long-run marginal cost is the result of changes in the cost of all inputs.

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COMPLEMENT-IN-PRODUCTION

One of two (or more) goods that are simultaneously produced using a given resource. A complement-in-production is one of two alternatives falling within the other prices determinant of supply. The other is a substitute-in-production. An increase in the price of one complement good causes an increase in supply for the other.

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Today, you are likely to spend a great deal of time driving to a factory outlet wanting to buy either a black duffle bag with velcro closures or any book written by Isaac Asimov. Be on the lookout for crowded shopping malls.
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Helping spur the U.S. industrial revolution, Thomas Edison patented nearly 1300 inventions, 300 of which came out of his Menlo Park "invention factory" during a four-year period.
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